Milling machine



FIG. 1 is a front perspective view of a milling machine embodying our design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a right elevational view thereof; and,

FIG. 7 is a left elevational view thereof. 

The ornamental design for a milling machine, as shown and described. 